Did you know that...?

As you may know the film Grease is based on a musical but, did you know that some of the actors from the film also appeared in the musical?
1.John Travolta in the film is Danny but in the musical he is Doody, one of the T-birds.
2.Jeff Conaway in the film is Kenickie but in the musical he was Danny.
3.Barry Pearl is Doody in the movie but he was Sonny in the musical
4.Jamie Donnelly is Jan in The movie and in Broadway.